Answers

Subtract 40/63 from 28/54

28/54 - 40/63 is -22/189.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 54 and 63 is 378
   
   Next, find the equivalent fraction of both fractional numbers with denominator 378
2. For the 1st fraction, since 54 × 7 = 378,
   28/54 = 28 × 7/54 × 7 = 196/378
3. Likewise, for the 2nd fraction, since 63 × 6 = 378,
   40/63 = 40 × 6/63 × 6 = 240/378
4. Subtract the two like fractions:
   196/378 - 240/378 = 196 - 240/378 = -44/378
5. After reducing the fraction, the answer is -22/189

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